五分之一

wǔfēnzhīyī
one fifth

CEDICT

Entry Composition

1 五 wǔ
  1. five
  2. 5
2 分之 fēnzhī (indicating a fraction)
3 一 yī
  1. one
  2. single
  3. a (article)
  4. as soon as
  5. entire; whole; all; throughout
  6. "one" radical in Chinese characters (Kangxi radical 1)
  7. also pr. yāo for greater clarity when spelling out numbers digit by digit